Jsed - a sed in JavaScript

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About JSed

Here is a implementation of sed in Javascript. It features mostly POSIX sed but for some exceptions. Despite what one might fear it is not untolerably slow because it relies internally on the Javascript native Regular Expressions.

Run JSed

you can:

Run JSed by giving your sed script;
Check Jsed, by executing the test suite. Some tests delibarately fail to test the testing environment itself. Only 4 out of 459 tests should fail.

The JSed engine itself is a self-contained javascript file, which can be used by several HTML files for different usages. Here are two examples of directly supplying the sed script:

Run sedcheck.sed, a sed script which diagnoses portability issues of other sed scripts (see description here);
Run dc.sed, the amazing calculator by Greg Ubben.

User's manual

Quick intro

Edit the sed script into the Script editing area; edit the input into the Input editing area; then click on the run button to compile the script internally and then execute it on your input. If errors are found when compiling, they are displayed in bold face in the bottom of the window and the script is not executed. Else the output appears in the bottom of the window.

There are three settings that affect the behaviour of JSed:

-n flag: If this checkbox is checked, then the default that normally takes place at the end of each cycle is suppressed (this is equivalent to giving the -n option on the command line). If the first two characters of the script are #n then it is equivalent to checking this option.
POSIX flag: If this checkbox is checked, then some sed extensions are disabled.
jumpmax: JSed will stop if that many jumps (due to {, b, t or D) occur while processing the same input line.

Full manual

The complete user manual is on a separate page.

Download

Download the full archive: jsed-1.0.tar.gz (48 kB)